Automatic stop for motor-driven machines.



8. DE P. CURRY.

AUTOMATIC STOP FOR MOTOR DRIVEN MACHINES.

APPLICATION FILED 001115. 1915.

Patented A R-18, 1916 l/WE IV TOR Sta a fla s w Carr WITNESSES UNITED STATES STOBO DE PASS CURRY,

OF KEY WEST, FLORIDA.

AUTOMATIC STOP FOR MOTOR-DRIVEN MACHINES.

Application filed October 15, 1915.

To all whom it may concern.

Be it known that I, Srono DE Pass CURRY, a citizen of the United States, and a resident of Key West, in the county of Monroe and State of Florida, have invented a new and Improved Automatic Stop for Motor- Driven Machines, of which the following is a full, clear and exact description.

My invention is intended more particularly for use in connection with that type of electric motor designed to operate sewing machines and the like, the motor being mounted to rock in a vertical plane. A. spring tendsto rock the motor upwardly to disestablish driving connection with the sewing machine and a pedal device has connection with a lateral arm on the motor to establish driving connection with the sewing machine. In practice, in operating sewing machines by the motor referred to, the release or driving connection by the operator pressing on the pedal controlling the motor drive does not lnstantaneously stop the sewing machine so that the work cannot be stopped at the precise point desired.

The prime object of my invention is to provide a stop for the sewing machine adapted to be mounted so as to be controlled by the rocking movements of the motor and to instantaneously arrest the balance wheel or hand wheel of the sewing machine upon the release of the driving connection with the motor.

The invention will be particularly explained in the specific description following.

Figure 1 is a side elevation ota rockably mounted electric motor with a part of a sewing machine showing my improved stop in vertical section; and Fig. 2 is a perspective view partly in section of the improved stop device detached from the motor.

The motor 10, of known type, is rockably mounted as at 11, and has a lateral arm 12, against which a plate spring 13 bears, tending to rock the motor to the upper position, that is, into a position to release the drive connection between the motor and a sewing machine 14. The usual actuating means between the motor and sewing machine consists of a belt 15, which runs around a drive pulley 16, revolubly mountedon the arm 12, to rock vertically therewith and having suitable driving connections with the motor shaft. The belt runs also over a pulley 17, on the sewing machine. In this type of Specification of Letters Patent.

Patented Apr 18. 1916.

Serial No. 55,996.

motor, a pedal, (not shown), is onnected by a cord or strap 18, with the arm 12, so that a depression of the pedal will do ress sa d arm 12, against the tension 0' the spring 13. The depression of the arm 12, brings the drive pulley 16 into frictional driving engagement with the belt 15, thus tightening the belt and causing the pulley 17, of the sewing machine and with it the hand wheel or balance wheel 19, to revolve. In accordance with my invention 1 provide on the arm 12, a stop designated generally by the numeral 20, to engage the wheel 19, of the sewing machine when the drive connection with the motor is disestablished. The said stop 20, includes a post or shank 21, which is fastened in any suitable manner to the arm 12, in the plane of the wheel 19, of the sewing machine. As here shown, the shank is tapered and fits in a tapered socket 22, of the arm 12, but any other approved means may be employed to secure the stop in position on the arm 12. On the upper end of the shank 21, is resilient head 23, preferably in the form of a block of soft rubber.

With the described arrangement it will be seen that when a pull is exerted on the usual pedal connection 18, to depress the arm 12 and establish driving engagement with the sewing machine 14, the stop 20, will be drawn away from the balance wheel 19, permitting the latter to freely revolve. On the other hand when the pedal connection 18 is released and the spring 13, throws the arm 12 upwardly thus relieving the driving friction between the pulley 16, and the belt 15, the resilient head 23, of the stop 20, will frictionally engage the balance wheel 19 and instantly arrest its motion. Thus 1 utilize the pressure of the spring 13, that rocks the motor for also establishing the frictional engagement of the stop with the sewing machine.

The use of the invention in practice, has proven of a great value in enabling the operator to stop a piece of work exactly at a point desiredwhere as heretofore it was only a rare chance that resulted in the stopping of the work at a desired point, the lack of control of the sewing machine causing the sewing to be continued beyond the desired point or to stop short of the point desired.

Having thus described my invention 1 claim as new and desire to secure by Letters lish or release the driving connection of the drive element With the said actuating means, and a stop in fixed position on the lateral arm and located thereon outward from 'the said drive element to directly engage and arrest the driven element upon release of the actuating means, and to disengage the driven element When the actuating means is engaged by the drive element.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

STOBO DE PASS CURRY.

Witnesses:

ELIZA DEAN, CHAS, M. ZEQUEIRA. 

